Chitosan-MnO2 nanocomposite for effective removal of Cr (VI) from aqueous solution

Dinh, Van‐Phuc; Nguyen, Minh-Doan; Nguyen, Quang Hung; Do, Thi-Thanh-Thao; Luu, Thi-Thuy; Luu, Anh Tuyen; Tap, Tran Duy; Ho, Thien-Hoang; Phan, Trong Phuc; Nguyen, Trinh Duy; Tán, Lê Văn

doi:10.1016/j.chemosphere.2020.127147

Cited by 68 publications

(12 citation statements)

References 38 publications

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“…In other pure adsorbents, it was also observed that these adsorbents were not very effective in the immobilization of Cr in soil, but the preparation of chitosan composites with more efficient properties increased the efficiency of the pure adsorbents for the Cr immobilization in the soil. These results are consistent with the findings of Ngah et al (2012), Burk et al (2020), andDinh et al (2020).…”

Section: Adsorption Mechanisms Of Cr 6+ On Different Adsorbentssupporting

confidence: 94%

“…Therefore, chitosan-coated gasified biochar removed more Cd 2+ (17.2 mg/g) and Cu 2+ (25.8 mg/g) than the uncoated gasified biochar. Dinh et al (2020) investigated the adsorption of Cr 6+ onto manganese dioxide-chitosan nanocomposite material from aqueous solutions. The results obtained show that calculated Langmuir monolayer adsorption capacity was 61.56 mg/g at pH of 2.0 and adsorption time of 120 min.…”

Section: Introductionmentioning

confidence: 99%

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The effects of chitosan composites on the immobilization of chromium in soil and marigold (Calendula officinalis) growth

Najafi

Golchin

Naidu

2021

Int. J. Environ. Sci. Technol.

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To study the effectiveness of various chitosan composites on the stabilization of Cr 6+ in contaminated soils and growth characteristics of the marigold plant, a factorial pot trial with completely randomized design and three replications was performed in controlled conditions. The experimental treatments were: the contamination levels of soil to Cr (0, 20, 60 and 180 mg/kg) and adsorbent types (pure chitosan, biochar, zeolite and manganese dioxide, composites of chitosan-biochar, chitosan-zeolite, chitosan-manganese dioxide and control). The results showed that increasing the concentration of Cr in the soil interfered with the processes of nutrient uptake by the marigold and led to a significant reduction in growth characteristics. But the addition of adsorbents to the soil by immobilizing some of the available Cr reduced marigold uptake of Cr and thus reduced its toxic effects. By adding adsorbents to the soil, marigold uptake of nutrients such as phosphorus, potassium and iron was improved, and growth indices increased. Among the adsorbents used in this experiment, the chitosan-manganese dioxide composite had a higher efficiency in the immobilization of Cr in the soil. By applying the chitosan-manganese dioxide composite to the soil at the rate of 0.5% W/W, the concentration of Cr in the shoot of the marigold plant decreased about 87.61% when compared to the control treatment. But the shoot height and shoot dry weight increased by 48.38 and 59.28%, and the concentration of phosphorus, potassium and iron in plant tissues increased by 100.00, 129.62 and 320.33%, respectively.

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Section: Adsorption Mechanisms Of Cr 6+ On Different Adsorbentssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

The effects of chitosan composites on the immobilization of chromium in soil and marigold (Calendula officinalis) growth

Najafi

Golchin

Naidu

2021

Int. J. Environ. Sci. Technol.

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“…When pH = 3, the r e value of Cr(VI) reached 97.69%. It is higher than those of α–Fe 2 O 3 /GO nanocomposite (86.31%) [ 40 ], magnetic greigite/biochar (MGBs) composites (93.00%) [ 72 ], MnO 2 /CS nanocomposite (94.21%) [ 73 ] and polyamine modified carbon nanotube (PA–CNT) adsorbents (95.00%) [ 74 ]. These results indicated that the adsorbent did not cause secondary pollution to the environment, and at the same time retained good stability and a high removal rate in a strongly acidic solution.…”

Section: Resultsmentioning

confidence: 99%

Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

et al. 2022

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Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased with C0, t, and T but decreased with increasing pH and m/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42− > PO42− > NO3− > Cl− and Ca2+ > Mg2+ > Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3, m/v = 1.0 g/L, T = 298.15 K, and C0 = 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.

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“…For the fourth time adsorption–desorption cycle, there is a marked decline for the Cr (VI) adsorption from 118.5 ± 0.3 mg/g to 93.4 ± 0.1 mg/g, which may be due to PDA consumption from PES/PDA ultrafine fibers or the parts of functional groups were inactivation. It shows that the PES/PDA ultrafine fibers have higher reusability (decrease by 1.8% for 3 cycles) than the other adsorbent materials, α‐Fe 2 O 3 @C nanocomposites 54 (decrease by 4.2% for 3 cycles), succinate/Alg porous gel beads 55 (decrease by 4.9% for 3 cycles), and MnO 2 /CS adsorbent (decrease by14.1% for 5 cycles) 56 …”

Section: Resultsmentioning

confidence: 99%

A high Cr (VI) absorption efficiency and easy recovery adsorbent: Electrospun polyethersulfone/polydopamine nanofibers

Wei

Zhang²,

Wang

et al. 2021

J of Applied Polymer Sci

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Cr (VI) is a highly toxic pollutant to humans, to achieve high adsorption capacity, easy recovery, and good reusability, polyethersulfone/polydopamine (PES/PDA) ultrafine fibers were prepared successfully. A series of preparing effect factors were investigated systematically and the optimum one is 8.5 pH value at room temperature and 2 g/L dopamine concentration. And then they were used as an adsorbent for the removal of Cr (VI) ions from wastewater. The effect factors pH, the adsorbent dosage, and time were discussed on Cr (VI) adsorption process and the Cr (VI) adsorption behavior was investigated. It is found that the maximum Cr (VI) adsorption capacity is 115.2 ± 4.8 mg/g at pH = 3 using 0.06 g PES/PDA with 80 mins. The Cr (VI) adsorption process followed the pseudo‐second‐order model (r2 ≥ 0.99) and adsorption isotherms were fitted to the Langmuir model (R2 ≥ 0.999). Furthermore, the Cr (VI) adsorption mechanism was supposed according to the X‐ray photoelectron spectroscopic results. Finally, PES/PDA ultrafine fibers were considered to be a promising adsorbent with good stability (decomposing temperature, 356°C), high adsorption efficiency (112.1 ± 2.5 mg/g), and good reusability (three times) on the coexistence of anions and the actual industry wastewater environment.

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Chitosan-MnO2 nanocomposite for effective removal of Cr (VI) from aqueous solution

Cited by 68 publications

References 38 publications

The effects of chitosan composites on the immobilization of chromium in soil and marigold (Calendula officinalis) growth

The effects of chitosan composites on the immobilization of chromium in soil and marigold (Calendula officinalis) growth

Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

A high Cr (VI) absorption efficiency and easy recovery adsorbent: Electrospun polyethersulfone/polydopamine nanofibers

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